Compact Design-Smaller For Comfort ENC 2-mic Technology-Hear the Other One Clearly up to 4.5 hrs on single charge; case provides additional 12 hrs IPX4 Splash & Sweat Protection-All-weather Protection Just set up once and you can just enjoy the convenience Open the case and earbuds will automatically connect with your device crystal-clear audio ensures that you can groove to your favorite music albums to the fullest